- A bolt on a lock that is moved by turning the key or knob without activation of a spring.无弹簧锁闩：一种锁闩，在没有弹簧的作用下，靠转动钥匙或把手使它移动
- unifactorial
- Unification Church
- unified
- unified field theory
- unifies
- unifilar
- unifoliar
- unifoliate
- unifoliolate
- uniform
- uniform
- uniformed
- uniformer
- uniformest
- uniforming
- uniformitarianism
- uniformitarianisms
- uniform resource locator
- uniforms
- unify
- unifying
- unilateral
- unilateralism
- unilateralisms
- unilinear